#include <stdio.h>
int main()
{
	char grade;
	scanf("%c",&grade);
	printf("your score:");
	switch(grade)
	{
		case'A':
			printf("85~100\n");
			break;
		case'B':
			printf("70~84\n");
		 	break;
		case'C':
			printf("60~69\n");
			break;
		case'D':
			printf("<60\n");
			break;
		default:
			printf("enter data error!\n");
			
	}
 } 
